A Measurement of the Semileptonic Branching Fraction of the B_s Meson
The BaBar Collaboration: J. P. Lees, V. Poireau, V. Tisserand, J., Garra Tico, E. Grauges, M. Martinelli, D. A. Milanes, A. Palano, M., Pappagallo, G. Eigen, B. Stugu, D. N. Brown, L. T. Kerth, Yu. G. Kolomensky,, G. Lynch, H. Koch, T. Schroeder, D. J. Asgeirsson, C. Hearty
TL;DR
This paper measures the semileptonic decay rate of the B_s meson using data from the BaBar detector, providing a key parameter for understanding B_s properties and testing the Standard Model.
Contribution
It presents the first simultaneous measurement of the B_s semileptonic branching fraction and production rate relative to all B mesons across different energies.
Findings
Semileptonic branching fraction of B_s: 9.5% (+2.5/-2.0 stat, +1.1/-1.9 syst)
Method uses phi meson yields and high-momentum leptons
Provides energy-dependent measurements of B_s properties
Abstract
We report a measurement of the inclusive semileptonic branching fraction of the B_s meson using data collected with the BaBar detector in the center-of-mass (CM) energy region above the Upsilon(4S) resonance. We use the inclusive yield of phi mesons and the phi yield in association with a high-momentum lepton to perform a simultaneous measurement of the semileptonic branching fraction and the production rate of B_s mesons relative to all B mesons as a function of CM energy. The inclusive semileptonic branching fraction of the B_s meson is determined to be B(B_s to l nu X)=9.5 (+2.5/-2.0)(stat)(+1.1/-1.9)(syst)%, where l indicates the average of e and mu.
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